Straight Glass Dropper, made of Borosilicate 3.3. 3 standard sizes.
Check the item is clean and free of cracks or chips before use; heat only in a water bath or thermostatic device; avoid mechanical impact; specifications are subject to quotation.
BRAND IDENTITY
Vissal® is RichTech's own brand; RichTech is the company mark. Both are used together for this product's brand identification.
The following are common specifications. Custom joint combinations available upon request.
Request custom specs| Specification | Material |
|---|---|
| φ7~8×90mm | Borosilicate 3.3 |
| φ7~8×150mm | Borosilicate 3.3 |
| φ7~8×200mm | Borosilicate 3.3 |
The Straight Glass Dropper belongs to our reagent and sample bottle range and is mainly used for storing, dispensing, transferring and sampling reagents, samples and solvents. Standard sizes cover φ7~8×90mm、φ7~8×150mm、φ7~8×200mm. Widely used in wet chemistry, sample preparation and teaching laboratories.
The body is made of borosilicate 3.3 glass; coefficient of expansion about 3.3×10⁻⁶/K, clearly better thermal shock resistance than soda-lime glass. It works between -30℃ to 150℃ (thermal shock within 120℃); chemically it resists water, acids, salt solutions and most organic solvents; not for hydrofluoric acid, hot concentrated phosphoric acid or strong alkali; smooth transparent wall, low adhesion. Level, interface and residue are easy to read, keeping transfer errors small.
When selecting, confirm medium, temperature and connection first, then fix the size: the medium decides the material, the temperature decides whether heating or autoclaving is possible, and the connection decides whether it mates with existing apparatus. For duties outside the normal range — hot concentrated alkali, fluoride media, vacuum or repeated thermal cycling — our engineers can confirm a suitable option.
Parts are lamp-worked and blown from borosilicate tube or rod, annealed as a whole to relieve forming stress; joints and sealing faces ground in pairs, keeping items of the same size interchangeable. Work is carried out at controlled stations to prevent scratches and cross-contamination.
Each item is checked for appearance, dimensions and fit before dispatch; sampling covers capacity or graduation deviation, joint fit and wall uniformity. Items from the same batch stay consistent in size and feel, which simplifies central storage and reordering. Inspection records and batch information are available with the goods.
Typical applications
Handles storage and dispensing in reagent storage and sampling and is a common supporting item in such workflows.
Suited to solution preparation and sample transfer in daily work.
Used for incoming checks and batch-to-batch consistency comparison.
Straightforward structure and low operating threshold suit demonstrations and onboarding.
Carries material between weighing, dissolving, transfer and make-up, cutting cross-contamination and losses.
In method development it supports replicate runs with one consistent vessel format, reducing systematic error.
Choose by duty
Define the handling method, contact medium and temperature range before choosing material and interface.
Confirm the interface form before pairing with other apparatus; mismatches leak or will not assemble.
Choose material according to the contact medium and operating temperature; refer to the specification block.
Non-standard sizes, special interfaces or volume customisation are quoted separately.
Match size to the volume per run and the number of runs a day; oversize vessels add cleaning load, undersize ones force repeated batches.
Choose graduated or single-mark items when accurate metering matters; skip the accuracy premium for rough transfer work.
Service condition guide
| Condition | Suitability | Notes |
|---|---|---|
| Ambient storage and transfer | Suitable | acids, salt solutions and organic solvents for long contact |
| Water bath or heating mantle | Suitable | heat gradually to avoid local overheating |
| Direct flame | Conditional | use a wire gauze or mantle, never heat dry |
| Rapid heating or cooling | Conditional | keep single-step shock within 120℃; thick walls need slower ramps |
| Vacuum service | Conditional | only heavy-wall or purpose-made items; thin walls are not recommended |
| Hydrofluoric acid / fluorides | Not suitable | attacks the glass matrix; use PTFE or PP instead |
| Hot concentrated alkali or phosphoric acid | Not suitable | prolonged contact etches the surface |
| Autoclaving | Suitable | standard 121℃ cycle with moderate ramp rates |
Standard procedure
Fill only to a practical working level, leaving room for mixing and thermal expansion
Keep each stopper with its own bottle; mismatched joints leak
Use rubber stoppers for alkaline solutions, as glass stoppers may seize on long storage
Inspect for cleanliness, cracks and chipped edges before use; a crack spreads quickly under heat or load, so retire the item at once and never patch it.
Assemble as required for storage and dispensing and confirm the connection is secure.
Pour or transfer slowly along the wall to avoid impact on the base and splashing; with volatile or foaming media a slow stream cuts losses and cross-contamination.
If heating is required, use a water bath or thermostatic device only; never apply direct flame.
Clean promptly after use and choose the drying method according to the material; soak stubborn residues first and never scrape the wall with hard tools.
Before first use, clean according to the material; soak in dilute acid where appropriate, rinse thoroughly and dry. New items may carry processing aids, so clean before contact with samples.
Store without stacking or impact, in a ventilated and dry place; long stacking deforms the base, and volumetric ware should stand on its own.
Keep one batch together and label different sizes separately to avoid picking the wrong item; once mixed, the batch is hard to identify when a problem appears.
Keep a usage log with the commissioning date, media contacted and cleaning method, so replacement timing and traceability stay clear.
⚠️ Safety & handling notes
Alkaline solutions can bind glass stoppers; loosen periodically or use rubber stoppers.
Use amber bottles for light-sensitive reagents and check stopper tightness for volatile ones.
Sudden temperature changes create stress, especially in thick walls and wide openings; heat and cool gradually.
Avoid impact, dropping and scratching; never carry by a thin or weak section.
Clean immediately after use; dried residues are harder to remove. Avoid abrasive cleaning tools.
Air-dry or dry at low temperature; volumetric ware must never be oven-dried.
Check for cracks, deformation and seal failure after long use and replace when needed.
Items should carry a clear label and usage record; mixed use makes cleaning history and media contact untraceable.
Stop using an item for critical work once it is cracked, chipped, worn at the graduations or leaking; never patch and return it to service.
This entry uses Straight Glass Dropper as the baseline. Two further on-site entries are available for separate comparison: Candidate 1 — Bent Glass Dropper; Candidate 2 — Bent One-Bulb Glass Dropper. The two are listed separately and independently; neither substitutes for the other, and neither is stated to match the product on this page.
The shape labels are: Straight for the product on this page, Bent for candidate 1, and Bent one-bulb for candidate 2. This comparison is limited to the shape categories recorded on the site and is not extended beyond them.
Sources: EV-043,EV-038
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